Combined typewriting and computing machine



G. E. DE HAVEN AND 0. G. SCHAAF. COMBINED TYPEWRITING AND COMPUTINGMACHINE.

APPLICATION FILED SEPT. 4, 1920.

Patented Oct. 17, 1922.

3 SHEETS-SHEET l.

G. E. DE HAVEN AND D. G. SCHAAF. COMBINED TYPEWRITING AND COMPUTINGMACHINE.

APPLICATION FILED SEPT. 4. 1920.

Patented Det. 17, 1922.v

3 SHEETS-SHEET 2.

G. E. DE HAVEN AND O. GJSCHAAF. COMBINED IYPEWRIIING AND COMPUTINGMACHINE.

APPUCATION FIL'EDSEPT. 4, !920.

Patented Oct. .17 1922.

3 SHEETS-SHEET 3.

Patented Oct. 17, 1922.

UNITED STATES PATENT OFFICE.

GILBERT E. DE HAVEN AND OSCAR G. SCHAAF, OF SAN FRANCISCO, CALIFORNIA,ASSIGNORS TO UNDERWOOD COMPUTING MACHINE COMPANY, OF NEW YORK,

N. Y., A CORPORATION OF NEW YORK.

COMBINED TYFEWRITING AND COMPUTING MACHINE Application filed September4, 1920. Serial No. 408,223.

To allai/710m it may concern.'

Be it known that we, GILBERT E. DE HAVEN, a citizen of the United Statesof America, residing in San Francisco, in the county of San Franciscoand State of California, and OSCAR G. SCHAAF, a citizen oi' the UnitedStates of America, residing in San Francisco, in the county of SanFrancisco and State of California, have invented certain new and usefulImprovements in Combined Typewritin and Computing Machines, of which theollowing is a specifi; cation.

This invention relates to combined typewriting and computing machines,and is illustrated as applied to the Underwood bookkeepinor machineshown in Patent to F. A. Hari, ivo. 1,270,411, dated June 25, 191s. Saidmachine is provided with one or more registers, each provided with a setof computing elements arranged in denominational order, which areoperated individually by denomination-selecting mechanism as thetypewriter carriage passes through a coinuting zone, and the digits thatare typed gy the various numeral-keys are set up by means of indexingdevices on the computing elements. Subsequently, the number may be runinto the register dial-wheels.

The denomination-selecting mechanism includes a selector which operatessuccessively certain jacks associated with the computing elements to setthe latter.

n. cam-roller is engageable by a normally ineffective selector on thetypewriter carriage to determine the active period of the computingmechanism in the travel of the carriage. When the carriage is returnedto begin a new line of writing, the selector snaps past the jacks,causing considerable noise and adding to the wear of the machine,especially when several selectors are used, and when the carriage isreturned rapidly, as, for example, by a motor.

A feature of this invention' is the rendering of thedenomination-selecting mechanism ineffective, or the silencing thereofso that no parts thereof can be engaged by the carriage, and to affordfree movement of the carriage when it is bein returned to the beginningof a new Writing line. To this end, provision is made to automaticallyren der the. computation-controlling camlroller ineffective, so that thedenomination-Sele@ tors remain in their ineffective positions relativelyto the jacks during the return of the carriage.

The computation-controlling element is held 1n its ineffective positionor the silencing is maintained until the latter part of the returnmovement of said carriage, when the computation-controlling elementresumes its effective position.

The Underwood bookkeeping machine is usually provided with ageneral-operator key, which starts the motor to drive the generaloperator to run the set-u number into the register. 'Said machine 1sfurther provided with a carriagereturn key, whic is effective to startthe motor to return the carriage. in the last column, it is customary tooperate the general-operator key to run in the number, and then actuatethe carriage-return key to effect the 'return of the carriage. Inpractice, it happens that the operative sometimes for ts to actuate thegeneralopera-tor key, ut effects the return of the carriage, andproceeds to set up another number before the previously set-up number isrun into the register, consequently causing an erroneous computationwhen the general operator is actuated to run in the last set-up number.

An object of this invention is to obviate the afore-mentioneddifficulty. This may be done by means o erable by the carriagereturn keyto effect the return of the carriage and cause the general operator tofunctionate, to run in the number, simultaneously.

A. further feature of the invention is the rendering of the numeral-keysineffective while the carriage is being returned to its initial writingposition, so as to prevent the After a number has been typed vnumeral-types from striking the platen, b a premature operation thereof,or, in `ot er words, while the carriage is returning.

Another feature of the invention relates to restoration of the state ofthe machine to addition when the carriage is returned from a subtractionzone.

Other features and advantages will hereinafter appear.

1n the accompanying drawings,

Figure 1 is a sectional side elevation of the machine, showing theinvention applied thereto.

Figure 2 is a detail view of the carrlage escapement mechanism.

Figure 3 is a side view, partly in section, of the lower part of themachine, showing the motor and the connection to the general operator.

Figure 4 is a skeleton perspective view of the parts, as seen from therear and upper left-hand corner of the machine.

Figure 5 is a circuit diagram, showing the motor and two switchesconnected therein.

v Fi re 6 is a detail top plan view, showing t e retaining means to holdthe computation-determining element in its ineffective position.

N umeral-keys 9 and alphabet-keys 10, when depressed, swing key-levers11 and 12, respectively, about a fulcrum rod 13, to actuat/e bell-cranks14, to swing type-bars l5 upwardly and rearwardly to .cause types 16thereon to print against the front' side of a platen 17, which carries'awork-sheet (not shown). 'llhe platen is rotatably mounted in a carriage18, supported to travel on railsA 19 and 20 onta main frame 21, and isurged from right to left by a spring-drum 22, connected to theright-hand end of the carriage by a strap 23, so that it may be fed to anew letter-space position at each type stroke. To effect theletter-spacing movements of the carri'a e, each type-bar 15 is providedwith a hee 24 to engage a universal bar 25 to move the latter rearwardlyagainst the tension of a return spring (not shown). Thus, the universalbar is reciprocated at each type stroke, and consequently a dog rocker26, engaged by a cross-bar 27 of the universal bar 25, is operated toreciprocate a loose dog 28 and a fixed dog 30, between the teeth'31 ofan escapement-wheel 32, to eti'ect a letter-space movement of theescapementwheel and the carriage; the escapementwheel 32 having theusual one-way driving pawl connection with a'pinion 34, meshing with afeed-rack 35 pivoted at 36 on the carriage 18.

While the digits of a number are being typed, they may be set up oncomputing elements or bars-37 arranged in' descending denominationalorder from left to right of the machine. rlhe computing bars areprovided at their forward end with racks 38 geared to dial-wheels 40 ofa register 41, so that the set-up number may be transferred to or runinto the dial-wheels.

To set up the digits of a number on the computing bars 37, each bar maybe provided with a set of nine indexing devices or pins 42, havingAvalues from 1 to 9, inelusive. The indexing pins 42 may be depressed bykey-actuated linkages including setting bars 43, to bring the lower endsof the indexing pins into the path of a crossbar 44 of a generaloperator 45. Eachlinkage with its pin-setting bar 43 may be connected toa rock-shaft 46, there being one rock-shaft associated with eachnumeralkey, and each rock-shaft being operable by an arm 47, engaged bya plunger 48 on the corresponding numeral-key lever 11 when the latteris operated. `The indexing pins are normally behind and out of range ofthe pin-setting bars 43, so that ordinarily the pin-setting bars 43 movedown between the pins 42 when the numeral-keys 9 are operated. When thecarriage traverses the computing zone, the computing bars 37 are movedforward individually, in denominational order, to locate the varioussets of indexing pins 42 under the pin-setting bars 43. The locating ofthe indexing pins may be done by denomination-selecting mechanism,hereinafter described, which is actuable by the carriage 18. Eachpin-bar 37 is held in its pin-setting position while the carriageoccupies the corresponding denominational position in the computing Zoneuntil a digit is typed in said position, so that the indexing pin havinga value corresponding to the value of the typed digit may be set ordepressed upon the computing bar. Upon the return of the type-key, thecarriage moves to the next denominational position, thus allowing thecomputing bar with the depressed indexing pin to return, while thecomputing bar of next lower denominational order is moved to itspin-setting position when the next digit may be typed. Thus, the variousindexing pins are set on the various computing bars as the digits aretyped, while the carriage traverses the computing zone.

The denomination-selecting mechanism for moving the computing bars 37 totheir pin-setting positions maycomprise a dog or selector 50, mounted ona bar 51 supported on the typewriter carriage. Theselector is adjustablelengthwise of the carriage to a column of numbers to be computed, and isheld in its adjusted position by a rack-bar 52. The selector normallyoccupies the ineffective position indicated in dotted lines in Figure 1.When the carriage enters the computing zone, the selector is swung toits effective position by a computation-controlling element in the formof a cam-roller 53, which isgngaged by a roller 54 on the selector, sothat the selector mamon rides up on the cam-roller to 55 of the selectorinto with a set of jacks 56,

move a tappet engaging relation pivoted on a rod 57 and arranged fromright to left in descending denominational order. The jacks 56 areoperated individually as the carriage moves through the computing zone.Each jack depresses a thrust rod 58v to operate an intermediate lever 60associated therewith. Each intermediate lever 60 engages with atransposition device 61, to operate a bell-crank 62 about a fixed pivot63, and move the associated computing bar 37 forward against a returnspring 64 to its pinsetting position. Thus, the computing bars 37, whichare arranged in descending denominational order from left to right, arerendered efl'eqtive through the transposition devices 61 by the jacks56, which are arranged in descending order from right to left; the jacksbeing so arranged that the carriage, which moves from right to left, mayengage with the jacks in their proper denominational order.

It will be understood that a plurality of selectors may be used toeffect the transfer of computations in several columns (crosscomputation) into a single register.

It will further be understood that a plurality of registers may be used,each comprising a set of computing bars 37 underlying the pin-settingbars 43; that each register may have associated therewith acomputation-controlling element 53 and one or more selectors 50; andthat, by a suitable arrangement of the selectors on the carriage, anumber typed in a single column may be set up on the computing bars ofseveral registers.

After a number has been set up on the computing bars of one or moreregisters, the general operator 45 may be caused to cycle by means of amotor 59 (Figure 3) to run the number into the dial-wheels. To start themotor, there may be provided mechanism which may be like that shown inthe patent to A. J. Wood, No. 1,299,646, dated April 8, 1919. Thismechanism may include a key 65, herein referred to, for clearness, as ageneral-operator key. Said key may be arranged at the right-hand side ofthe machine, and may be depressed, against the tension of a returnspring 66, to operate a lever 67, engaging with the outer end of ahorizontally-disposed lever 68 (Figures 1 and 4), to swing the latterabout a fixed pivot`70. The lever 68 extends inwardly to about themiddle of the machine, where it engages to raise a trip pin 71-out ofthe path of an ear 72 on a clutch member or disk 73, carried by studs74, which eX- tend through slots 75 in the clutch member and are-securedto a disk 76. The disk 76 is fixed toa shaft 77, which may be driven bythe motor 59 through a worm 78,

Iusual way at the return stroke on the motor shaft 80, meshing with awormwheel 81. The worm-wheel is loosely mounted on the shaft 77, so thatthe motor may rotate independently of the shaft 77. When the trip pin 71is raised, the disk 73 is given a preliminary movement by means of aspring (not shown) to effect a connection between the worm-wheel 81 andthe shaft 77. For this purpose, the clutch member 73 may be providedwith studs 82, which allow pivoted pawls 83 on the disk 76 to engage aratchet-wheel 84. rigidly secured to the worm-Wheel 81, thus couplingthe shaft 77 to which the disk 76 is secured, with the motor by thepreliminary movement of the clutch member 73. The motor 59, which may becaused to run intermittently, may be started by a switch 85, (Figure 5),connected in a motor circuit comprising conductors 85 and 86. The switchmay be closed by an extension 87 on said disk or clutch-rendering member73, (Figure 3).

After the shaft 77 is connected and the motor switch 85aL is closed, theshaft 77 rotates to drive the general operator 45 to run the set-upnumber into the dial-wheels. To drive the general operator, the shaft 77is provided at its left-hand end with a crankarm 87, having a crank-'pin88 engaging a block 90, the latter sliding up and down in a.` slot 91 ofa cross-head 92, as the arm 87 rotates with the shaft 7 7, to move thecrosshead forwardly and backwardly. The cross-head is guided by ahorizontal rod 93 moving in bearings 94 at each end thereof, and isprovided at its upper end with an arm 95 engaging a fork 96, secured tothe lefthand one of two guide-bars 97 of the general operator 45. Thus,as the cross-head 92 is reciprocated, the general operator is movedtherewith to run the number into the register on its forward stroke bymeans of the crossbar 44, and to restore the computing bars 37 on therearward stroke when the cross-bar 44 engages projections 98 on saidcomputing bars. The indexing pins are restored in the of the generaloperator. The motor is stopped automatically and the shaft 77 isdisconnected from the motor after the general operator is restored, asdescribed in the Wood patent hereinbefore referred to. A

The carriage may be speedily returned to the beginning of a new line,there being provided, for this purpose, carriage-returning means whichmay be similar to that disclosed in the patent to F. A. Hart, No.1,238,908, dated Sept. 4, 1917. The carriage-returnin means may comprisea starting key 100 igures l and 4), which, when depressed, swings abell-crank lever 101 abouta pivot 102, against the tension of a returnspring 103, to release a slide 104 by means of a pivoted cam member 105on said slide 101. The cam member 105 is engaged by a nose 101a on thelever 101, to raise the slide 101 to release it from a', front plate106, which engages in a notch 107 in the slide 101. rThe slide 101, uponits release, is moved rearwardly by a spring 108, to rock a shaft 109 bymeans of an arm 110, secured to said shaft and connected to said slide.The shaft 109 is rocked by the slide 101 to connect a pinion 111,meshing with a rack 112 on the carriage, with a shaft 113 by sliding thepinion on said shaft into engagement with a clutch member 111 secured tosaid shaft. rThus, the drivingconnection is completed between the rack112 on the carriage and the shaft 113, after which the carriage may bereturned by the motor 59, which, when started, drives a counter-shaft115 by means of a belt 116; the driving connection between thecounter-shaft 115 and the shaft 113 comprising a belt 117. rlhe`connection from the rock-shaft 109 to the pinion 111 may comprise anupwardly-extending arm 118, connected by alink 120 to adownwardly-extending arm 121 on a shaft 122, torock the latter; theshaft 122 having an arm 123 projecting into an annular groove 121 of thepinion 111, so that the pinion 111 may be moved into and out otengagement with the clutch member 111.

rl`he motor 59 is normally at rest and a second switch 125 (Figures 1, 5and 6) may be closed to start the motor when the pinion is connectedwith the clutch member 111. For this purpose, the rock-shaft 109, whichis operated by the spring 108 through theintermediary of the slide 101,is provided with a downwardly-extending arm 126, hav- V12% composed oftwo members 128 and 129 with an intermediate spring 131 connectedbetween them. rllhe lthrust-bar is moved rearwardly, when the slide 101is released by the carriage-return key, to operate a pivoted member ofthe switch 125 to close said switch to start the motor 59. Thus,- thepinion 111 and the switch 125 are both operated by the carriage-returnstarting slide 101 and may be operated simultaneou'sly.

From the foregoing, it will be understood that the general-operator key65 and the carriage-return key 100 are each operable to render a clutcheffective 'and close a switch, so that the motor may drive the generaloperator and the carriage-return mechanism,`respectively, and that thegeneral opn erator may be actuated independently ot the carriage-returnmechanism, and vice versa,

rl`he carriage-return motor-switch 125 remains closed until the carriareaches the end ot its return movement, when it is automatically openedto stop the motor. To this end, there is provided on the carriageconnected thereto ayieldable thrust-barv 18 a projection 132, whichengages a cam 133 associated and adjustable with the usual rightflzandmargin-stop 131. The cam 133 is splined to a shaft 135 and, whenoperated, rocks the latter to pull forwardly a link 136, connected to anarm 137 on said shaft 135. The link 136 is connected to operate a secondlink 138, guided by a screw 110 on the righthand end of the main frame21. The link 138 is connected to an arm 111 to rock the shaft 122 backto normal position; thus moving the pinion 111 out of engagement withthe clutch member 111, by. means of the arm 123 engaging said pinion. Itwill be seen that the rock-shaft 109, which is connected to the shaft122, is also operated, and consequently the thrust-bar or switchplunger127 is restored to normal posit-ion, thus permitting the switch 125 tobe opened, which may be done by means of aspring.

When the shaft 109 is rocked back to'normal position, the slide 101moves forwardly against the tension of the spring 108 and catches on theiront plate 106 to be retained in normal position. y

After a number has been typed in a column, the carriage may be returnedby means ot the carriage-return key 100 to the irst position in the samecolumn, or to the first position in another column, according tothesetting of the right-hand marginstop.` Before the next number istyped, however, it is necessary to run in the set-up number, which maybe eiected by means of the general-operator key 65. 1n practice, theoperative sometimes forgets to run in the set-up number and proceeds totype the next number, thus setting up another number on the computingbars, in addition to the one already set thereon. Consequently, when thegeneral-operator key is actuated to run in the last typed number, anerroneous result is obtained.,

Provision is herein made to obviate the foregoing. 'lo this end, aconnection may extend trom the carriage-return key 100 to renderedective the clutch comprising the pawls 83 and ratchet wheel 81, toeflect the Adrive of the general operator at each actuation of said key.Said connection may comprise a link 112 suitably, connected at 113 tothe carriage-return key-lever 101, so that the latter, when depressed,swings an arm 111, by means of the link 112, torock a shaft 115 to whichthe arm 111 is secured. The rock-shaft 115 may extend across near thefront ot the machine and may be supported in brackets 116 on thecomputer trame 117. The rock-shaft is provided, near the middle, with anarm 118 to engagea lever 150 to swing the latter about its pivot 151 ona bracket 152 secured to a. base plate 153. The rear end of the lever150 engages the inner end ont the horizontally-disposed operating lever68, to lift the trip pin 71 out of en.`=

gagement with thev disk 73 to render effective sad clutch. Thus, thegeneral operator 45 is caused to cycle to run in the number and thecarriage is returned by means of the motor 59, which is started bv theswitch 125. lThe clutch is automatically rendered ineffective when thenumber is run in, as previously described.

By inspection of Figure 5, it will be seen that the two motor switches85@L and 125 are connected in multiple in the motor cir-' cuit,comprising the conductors 85 and 86, and each switch is connected inseries with the motor 59. It will be understood that the switch 85a maybe closed by the generaloperator key 65 and automatically opened to stopthe motor when the general operator has completed its cycle. Themotor-switch 125, which is under the control of the carriage-return key101, is provided so that the motor may continue to run if the generaloperator completes its cycle before the carriage is completely returnedto its initial writing, position, when the switch 1s automaticallyopened by means of the mechanism operated by the projection or lug 132on the carriage. It will further be understood that both switches areClosed when the carriage-return key is operated, and that the closing ofthe switch 85a is merely incidental, as it is controlled by the disk orclutch-controlling member 73.

It is desirable to render the computationcontrolling elements orcam-rollers 53 ineffective or to silence the denomination-selectingmechanism during the return of the carriage, so as to prevent engagementofthe tappets 55 with the jacks 56, which ordinarily causes considerablenoise and wear of the machine, and also adds to the resistance offeredto the return of the carriage. To this end, the cam-rollers 53 may berendered ineffective automatically by means controlled by the generaloperator 45. Said means may comprise a bell-crank member 154, pivoted at155 on the computer frame 147 The bellcrank has a finger 156, whichnormally lies in a depression 157 in the left-hand guide bar 97 of thegeneral operator. As the general operator moves forwardly, the bellcrankmember is swung about its pivot in a clockwise direction by a cam 158 onthe guide-bar 97. An upwardly-extending arm 160 of said bell-crankengages a projection 161 on a link 162, to move the latter rearwardly;said link being guided at its forward end by a pivoted arm 163 andconnected at its rear end to swing a bell-crank member 164 about a fixedpivot 165. The bellcrank 164 comprises an arm 166, engaging an arm 167secured to a shaft 168 to rock the latter in a clockwise direction. Onthe rock-shaft 168 may be secured several pairs of arms 170, each air tosupport a camroller 53, so that allp of the cam-rollers may slide 104when 'the latter is be swung to their ineffective positions, indicatedby dot-and-dash lines in Figure 1, and against the tension of a spring171 when the shaft 168 is rocked. Thus, the selectors remain in theirlowermost or ineffective positions, also indicated by dot-and-dash linesin Figure 1, when the carriage is returning.

It will be understood that the general operator is effective to renderand maintain the cam-rollers ineffective while said general operator iscycling, during which time the carriage may be returned through aplurality of letter-spaces, The general operator may, however, return toits normal position before the carriage is fully restored to its initialwriting position, and consequently the cam-rollers 53 would, underordinary conditions, resume their normal effective positions. Provisionis herein made to retain .the cam-rollers in their ineffectivefpositions until the end of the return stroke o the carriage. For thispurpose, there may be provided a latch 172 to co-operate with thebellcrank 164, which is used to throw out the cam-rollers 53. The latch172 normally oc` cupies an ineffective 6), sc that the bell-crank 164may be operated to lock the numeral-keys 9, through the intermediary ofthe cam-roller 53, as hereinafter described, to obviate the possibilityof Setting the indexing pins 42 while the general operator is inactuation.

The latch 172 is rendered effective, when the carriage-return ke 100 isactuated, by means of a link 173 igures 4 and 6), connected to the arm110 on the shaft 109, which is operated by the carriage-return startingreleased by the carriage-return key 100; the latch being moved to itseffective position, indicated in dot and dash lines in Figure 6. As soonas the cam-rollers are moved to their ineffective positions through themedium of the bellcrank 164, a projection 174 on said bell-crank snapsbehind the latch 172', and consequently the cam-rollers are retained intheir ineffective positions until the latch is rendered ineffective. Thelatch 172 is pivoted at 175 on a fixed bracket 176 and is moved to itseffective position by a spring 177 when the link 173 is moved rearwardlThe connection 178 of the latch or paw 172 with the link 173 is such asto permit a slight movement of the pawl independently of the link 173when the projection 174 snaps behind the pawl. The latch 172 remains inits effective position until the carriage reaches the end of its returnstroke, when the projection 132 on the carriage engages the cam 133, torock the shaft l135 and the shaft 109 connected to the latter, torestore the latch 172 to its normal position by means of the link 173.Thus, the bell-crank 164 is released and the camrollers are drawn backto their normal positions by the spring 171, The carriage-reposition(Figures 4 and member or cam-roller 53, and that whenk thecarriage-returning means, including the motor 59, is started by thecarriage-return key 100, the motor becomes ettective to actuatethe'driving means, including the shaft 77 and the cross-head 92, tocycle the general operator, which, by means of the cam 158 and thebell-crank 154 operated thereby, renders the cam-roller 53 ineffectiveso as to be out of the path of the selector when the carriage isreturned. llt will further be understood that the cam-roller is held inits inefdective position by the latch 172, which is operated at the endof the return movement of the carriage to release the cammember of thedenomination-selecting means, so that the cam-member may resume itsetl'ective position.

To lock the numeral-keys 9 so as to obviate the possibility ot' settingthe indexing vpins 42 while the general operator is Dcycling, there maybe provided mechanism like that shown in the patent to W. L. Gumprecht,No. 1,237,895, dated August 21, 1917 This mechanism may include a lever180, which is swung about its pivot 181 by one of the cam-rollers 53when the cam-rollers are moved to their ineti'ective positions by thegeneral operator 45. rlhe lever 180, pushes downwardly on a rod 183 torock a bell-crank 184, to pull rearwardly on a link 185. rllhe link 185is connected by an arm 186 to a shaft 187, to rock the latter to move adog 188 between locked pawls 190, which prevent the depression ot thenumeral-keys through the intermediary ot stems 191 on the plungers 48,as clearly shown in the above-mentioned Gumprecht patent.

Since the numeral-keys are locked by means including the lever 180 whichis engaged by the cam-roller 53, and since the cam-roller is operated torender it ineffective relatively to the selectors 50 when the carriageis returned, it will be understood that the depression-preventingmeans,including the pawls 190, is operated to prevent the actuation ot' thenumeral-keys while the carriage is returning.

It will be understood that the driving means, including the generaloperator for the computing bars, has associated therewith the clutchcomprising the pawls 83 and ratchet 84, which is normally ineffective;that the carriage-returning means, including the shaft 113, has alsoassociated therewith a normally ineffective clutch comprising the pinion111 and the clutch member 1145 and that the carriage-return 4.. rasantekey 100 is edective to render both clutches eective and close themotor-switch 125 simultaneously to start the motor, so that the set-upnumber may be run in and the carriage returned.

'llhe computer frame or casing 147 may be connected in any convenientmanner with the main frame 21, so that they may be conveniently removedor assembled as a unit on the base plate 153. To assist in assembling,the computer casing may be provided with conical studs 192, received inholes 193 in bosses 194 on said base plate.

lt will be seen that the pin-operating lever 68 is pivoted on the baseplate 153, while the actuating arm 148 and the rockshatt 145 are carriedby the computer Jfra-me 147. This arrangement affords a brokenconnection between the arm 148 and the lever 150, to permit the computercasing to be readily assembled and removed from the base plate. 'lheconnections ot the crosshead 92 with the general operator 45, and thegeneral-operator key-lever 67 with the pin-retracting lever 68 alsopermit ot ready attachability or -detachability of the computer casingwith the parts carried thereby. When removing the computer casing, thebelt 117 may be slipped off one ot the pulleys in the usual way.

'llhe state of the machine is normally that of addition, and the machinemay be set to a state ot subtraction by mechanism which may be similarto that disclosed in the patent to H. Hanson, No. 1,278,812, datedSeptember l0, 1918, and the atent to Minton, No. 1,280,065, datedeptember 24, 1918; subtraction being performed by the well-knowncomplemental method. The machine may be set to the state of subtractionautomatically or manually, as described in the abovementioned Mintonpatent. To set it manually, there is provided a key 195 at the torwardend ot a thrust-rod 196, which may be pushed rearwardly to rock a shaft197 by means ot an arm 198, extending upwardly therefrom and to whichthe thrustbar 196 is-connected. rThe rock-shaft is provided with a pawl200, which normally engages in a notch 201to hold a subtraction-settingslide or bar 202 against the tension ot an operating spring 203. Whenthe rock-shaft 197 is operated, the pawl 200 is swung out of holdingrelation with the subtraction-setting slide 202, and, consequently, thelatter is pulled rearwardly by the spring 203. rthe slide 202 isconnected to rock a bell-crank 204 secured to a rock-shaft 205 pivotallysupported in the computer casing 147. The bell-crank 204 .is connectedto swing a universal bar 206 about a pivot 207 bymeans of an arm 208 onsaid bar 206. The universal bar 206 shifts the -rock-shafts 46 toconnect them with the pin-setting linkages 43 having valuescorresponding to ice" the complements of the rock-shafts. Consequently,the numeral keys 9, when operated, while the machine is in a state ofsubtraction, are effective to set the pins having values correspondingto the complements of the numeral keys, and, as a result, the complementof a number being typed is set up on the pin-bars, which may then be runinto the register by means of the general operator.

The subtraction-setting slide 202 may be restored to its normal positionby means of the cross-bar 44 of the general operator, which engagesduring its forward stroke with a projection 209 on thesubtraction-settng slide 'to push the latter forwardly. After thesubtraction slide has been restored, the pawl 200 again snaps into thenotch 201 by a spring 210 connected to the subtraction-settingthrust-bar 196.

From the foregoing, it will be understood that When the return of thecarriage 18' is effected from the subtraction zone, the general operatoris caused to functionate, thus causing the subtraction-setting slide 202and connecting mechanism to be restored bythe general operator, andconsequently restoring the state of the machine to that of addition.lith this arrangement, instead of requiring two operations, asheretofore, .to return the carriage and restore the machine to addition,only one operation is necessary, that of returning the carriage; themachine being restored to the state of addition automatically during thereturn of the carriage, the latter being effected by means of the key100.

Variations may be resorted to within the scope of the invention, andportionsfof the improvements may be used without others.

Having thus described our invention, we claim:

1. In a combined typewriting and computing machine, the combination of acarriage, computing mechanism, controlling means co-operating with saidcarriage to govern the active periodof the computing mechanism duringthe travel of said carriage, a finger-piece, inger-pieceecontrolledmeans to return said carriage, and means actuable by said finger-pieceto silence and maintain said controlling means silenced during thereturn'of said carriage through a plurality of letter-spaces.

2. In a combined typewriting and computing machine, the combination of acan riage, computing mechanism, controlling means co-operating with saidcarriage to govern the active period of said computing mechanism in thetravel of said carriage, carriage-returning means, operating means forsaid computing mechanism, controllable by said carriage-returning meansand means controllable by the operating means and by said carriag-returning means t0 silence and maintain the controllingmeans silencedduring the return of said carriage through a plurality of letter-spaces.

3. In a combined typewriting and computing machine,`the combination of acarriage, computing mechanism, controlling means co-operating with saidcarriage to govern the active period of said computing mechanism in thetravel of said carriage, carriage-returning means, driving means forsaid computing mechanism, means actuable by the driving means to`silence the controlling means, and means controllable by saidcarriage-returning means to throw said driving means into operation andto maintain the controlling means silenced after it. has been silencedby the driving means.

4. In a combined typewriting and computing machine, the combination of acarriage, computing mechanism, a denomination-selector on said carriage,means cooperating with said selector during the travel of the carriageto determine the active period of the computing mechanism,carmage-returning means, and means, thrown into action by actuation ofsaid carriagereturning means, to automatically silence and maintain theco-operating means silenced to render the denomination-selectorineffective during the return of the carriage through a plurality ofletter-spaces.

5. n a combined typewriting and computing machine, the combination of acarriage, computing mechanism, a denominationfselector or] lsaid,carriage, means cooperating with said selector during the travel of thecarriage to determine the active period Vof the computing mechanism,carriage-returning means, means, thrown into action by actuation of saidcarriagereturning means, to automatically silence and maintain theco-operating means silenced to render the denomination-selectorineffective during the return of the carriage through ai plurality ofletter-spaces, and means to render the co-operating means effective atthe end of the return movement of said carriage.

6. In a combined typewriting and computing machine, the combination of acarriage, computing mechanism, denominationselecting mechanism for saidcomputing mechanism, said denomination-selecting mechanism comprising aselector on said carriage and a set of jacks to be engaged by saidselector, means co-operating with said selector to render the selectoreffective when the carriage passes forwardly through a. computing zone,carriage-returning means and means thrown into action by actuation ofsaid carriage-returning means, to autoinatically render the co-operatingmeans in effective carriage is returned through a plurality ofletter-spaces,

and retain it ineffective when the y 7. fn a combined typewriting andcomputing machine, the combination of a carriage, computing mechanismcomprising denomination-selecting mechanism effective as the carriagepasses forwardly through a computing zone, the denomination-selectingmechanism comprising a selector, means to hold said selector ineffective position while the carriage traverses the computing zone,carriage-returning means and means thrown into action by actuation ofsaid carriagereturning means to render and maintain the holding meanslineffective when the carriage is returned through a plurality ofletter-spaces.

8. fn a combined typewriting and computing machine, the combination of acarriage, computing mechanism comprising a denomination-selectingmechanism, the denomination-selecting mechanism comprising a selector,means to hold said selector in effective position while the carriagetraverses a computing Zone, carriage-returning means, means, thrown intoaction by actuation of said carriage-returning means, to render theholding means ineffective while the carriage is returning, and means torender-the holding means effective at the end of the return stroke ofsaid carriage.

9. ln a combined typewriting and computing machine, the combination of acarriage, computing mechanism comprising a denomination-selectingAmechanism effective as the carriage passes forwardly through a computingzone, the denomination-selecting mechanism comprising a selector, meansto hold said selector in effective position while the carriage traversesthe computing Zone, carriage-returning means, means, thrown into actionby actuation of said carriage returning means, to render the holdingmeans ineffective when the carriage is returned, and means to lock theholding means in ineffective condition while the carriage is returning.

10. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprisingI a denomination-selectingmechanism effective as the carriage passes forwardly through a computingzone, the denomination-selecting mechanism comprising a normallyineffective selector, means to hold said selector in effective positionwhile the carriage traverses the computing zone, carriage-returnlingmeans, and means, thrown into action by said carriage-returning means,to automatically render and maintain the holding means ineffective whenthe carriage is returned through a plurality of letter-spaces.

11. fn a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a denomination-.selectingmechanism, the denomination-selecting mechanism comprising Maaate aselector, a cam member to hold said selector in effective position whilethe carriage traverses a computing zone, carriage returning means, meansoperable by said carriage-returning means to render said cam memberineffective while the carriage is re turning, and means operable by thecarriage to render the cam member effective at the end of the returnstroke of said carriage.

12. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a denomination-selectingmechanism effective as the carriage passes forwardly through a computingzone, the denomination-selecting mechanismv comprising a selector, a cammember to hold said selector in effective position while the carriagetraverses the computing zone, carriage-returning means, means operableby said carriage-returning means to render said cam member ineffectivewhen the carriage is returned, a latch to hold salid cam memberineffective while the carriage is returning, and means to release saidlatch at the end of the return movement of said carriage.

13. ln a combined typewriting and com puting machine, the combination ofa carriage, computing mechanism comprising denomination-selectingmechanism, the denomination-selecting mechanism comprising a normallyineffective selector, means to hold said selector in an effective-position while the carriage travels forwardly through acomputing zone,carriage-returning means including a motor, and means actuable by saidmotor to render the first-mentioned means ineffective when the carriageis returned by said motor.

14. In a combined typewriting and com puting machine, the combination ofa carriage, computing mechanism' comprising denomination-selectingmechanism, the denom mation-selecting mechanism comprising a selector, acam member to hold said selector in its effective position while thecarriage traverses a computing zone, carriage-returning means includinga motor, and means actuable by said motor to render the cam memberineffective when the carriage is returned by said motor.

15. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising denomination-selecting means,eective as the carriage passes forwardly through a computing zone, thedenomination-selecting means comprising a selector, a cam member to holdsaid selector in its effective position while the carriage travelsforwardly through the computing zone, carriage-returning means includinga motor, motor-controlling means, means to actuate the motorcontrollingmeans to start said motor, means actuable by the motor to render the cammember inedective when the carriage is returning, means to automaticallyactuate the motor-controlling means to stop the motor, and meansactuable by the motor-controlling means to render the cam membereffective.

16. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a general operator, drivingmeans for the general operator, a motor to actuate said driving means,carriage-returning Amechanism operable by said motor, means to startsaid motor to return said carriage, said means being also effective torender the driving means effective, denomination-selecting means, andmeans operable by the general operator to render saiddenomination-selecting means ineffective While the carriage is beingreturned.

17. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a general operator, drivingmeans for the general operator, a motor to actuate said driving means,carriage-returning mechanism operable by said motor, a key to start saidmotor to return said carriage, means operable by said key to render thedriving means effective, denomination-selecting means,` means actuableby the general operator to render said denomination-selecting meansineffective While the carriage is being returned, normally ineffectiveretaining means, and means operable by said key to render said retainingmeans effective, said retaining means being effective to hold thedenomination-selecting means ineffective until the carriage is returned.

18. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a general operator, drivingmeans for the general operator, a motor to actuate said driving means,carriage-returning mechanism operable by said motor, a key to start saidmotor to return said carriage, said key being also effective to renderthe driving means effective, denomination-selecting means comprising aselector, a cam member to be engaged by the selector as the carriagetraverses a computing zone, means actuable by the general operator torender said cam member ineffective while the carriage is being returned,anormally ineffective latch, means operable by said key to render saidlatch effective, said latch being effective to retain thedenomination-selecting means ineffective until the carriage is returned,and means to actuate said latch to release said cam member at the end ofthe return stroke of said carriage.

19. In a combined typewriting and computing machine, the combination ota carriage, computing mechanism comprising a general operator. drivingmeans for the general operator, a motor to actuate said driving means,carriage-returning mechanism operable by said motor, a key to start saidmotor to return said carriage, means actuable by said key to render thedriving means effective, denomination selecting means, means actuable bythe general operator to render said denomination-selecting meansineffective While the carriage is being returned, a normally ineffectivelatch, means operable by said key to render said latch effective, saidlatch being effective to retain the denomination-selecting meansineffective until the carriage is returned, and means operable at theend of the return stroke of the carriage to actuate said latch torelease the denomination-selecting means.

20.4 In a combined typeu'riting and computing machine, the combinationof a carriage, computing mechanism comprising computing elements,denomination-selecting means, and a general operator for the computingelements, carriage-returning mechanism, means to actuate the generaloperator and the carriage-returning mechanism` and means actuable by thegeneral operator to render the denomination-selecting means ineffectiveWhile the carriage is returning.

2l. In a combined typ'ewriting and computing machine, the combination ofa carriage, computing mechanism comprising computing elements,denomination-selecting means, and a general operator, carriage-returningmechanism, means to actuate the general operator and thecarriage-returning mechanism, means actuable by the general operator torender the denomination-selecting means ineffective While the carriageis returning, the general operator being returned to normal positionbefore the return movement of the carriage is completed, and means toretain said denommation-selecting means ineffective until the carriageis returned.

22. In a combined typewritin-g and computing machine, the combinationof' a carriage, computing elements, denomination-selecting means forsaid computing elements, said denomination-selecting means comprising aselector and a co-operating member, a general operator,carriage-returning mechanism, means to actuate the general operator andthe carriage-returning mechanism, means actuable by the' generaloperator to render said co-operating member ineffective while thecarriage is returning` the general operator being returned to normalposition before the return movement of the carriage is completed. meansto retain said co-operating member ineffective until the carriage isreturned, and means to actuate the retaining means to release theco-operating member at the end of' the return stroke of the carriage. l

23. In a combined typewriting and com- 4puting machine, the combinationcfa carriage, computing mechanism comprlsing denomination-selectingmeans and a general operator, carriage-returning mechanism, means toactuate the general operator and the carriage-returning mechanism, meansaetuable by the general operator to render the denomination-selectingmeans ineffective While the carriage is returning, the general operatorbeing returned to normal position before the return movement of thecarri-age is completed, means to retain said denomination-selectingmeans ineffective until the carriage is returned, and means operable bysaid carriage at the end of its return movement to operate saidretaining means to release the denomination-selecting means.

24a-In a combined typevvriting and computing machine, the combination ofa carriage, computing elements, denomination-selecting means for saidcomputing elements, said denomination-selecting means being operableWhile the carriage passes 4through a computing zone, a general operatorfor said computing elements, normally ineffective driving means for thegeneral operator, a motor to actuate said driving means,carriage-returning means, a key, to start said motor, means operable bysaid key to render said driving means effective to return said carriage,means actuable by the general operator to render thedenomination-selecting means ineffective, normally ineffective.retaining means to hold the denomination-, selecting means ineffectiveWhile the carriage is returning, said retaining means being renderedeffective by said key, means to stop the motor at the en d of the returnof said carriage, and means operable by said stopping means to rendersaid retaining means ineffective.

25. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a general operator, drivingmeans for the general operator, starting means for said driving means,carriage-returning means, starting means for said carriage-returningmeans, and means operable by the carriage-return starting means toactuate the starting means for the driving means. i

26. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a general operator, drivingmeans for the general operator, carriage-returning means, starting meansfor said carriage-returning means, and means operable by thecarriagereturn starting means to start said driving means.

27. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a general operator, drivingmeans for the general operator, connecting means for said driving means,carriage-returning means, connecting means for said carriage-returningmeans, a motor to actuate the driving means and the carriage-returningmeans, and a key to actuate the carriage-return connecting means and theconnecting means for the driving means.

28. In a combined typevvritin and computing machine, the combination 0%a carriage, computing mechanism comprising a general operator, drivingmeans for the general operator, 4carriage-returning means, a motor toactuate the driving means and the carriage-returning means, connectingmeans for said driving means, a key to act-nate said connecting means,connecting means for said carriage-returning means, a key to actuate thecarriage-return connecting means, and means operable by thecarriage-return conneet-ing key to actuate the connecting means for thedriving means.

29. Inacombined typewriting and computing machine, the combination of acarriage, computing elements, denomination-selecting means for saidcomputing elements, said denomination-selecting means being operable bysaid carriage, a general operator for said computing elements, a motorto actuate the generaloperator, a switch to start said motor, a key toclose said switch, carriage-returning means actuableby said motor, asecond switch to start said motor, a key to close both of said switchesto start said motor, means operable to render the denomination-selectingmeans ineffective when the second-mentioned key is operated, means toopen the first-mentioned switch when the general operator has completeda cycle, means to retain said denomination-selecting means ineffectiveafter the generaloperator has completed its cycle, and means toautomatically open the second-men tioned switch. and to operate theretaining means to release the denomination-selecting means when thecarriage reaches the end .of its return movement.

30. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising denominational selectingmechanism including a selector, a cam member to hold said selector ineffective position While the carriage traverses a computing zone, amotor, a motor-circuit including a switch, carriage-returning mechanismby which the motor may return the carriage, said carriage-returningvmechanism including a clutch to connect the motor with the carriage orto disconnect it therefrom, a controllingl member for said clutch andsaid switch, spring means urging said controlling member to close theswitch and render said clutch effective, latching means to hold saidcontrolling member against the action of said spring means, acarriage-return key to release said controlling member, cani-controllingmeans, Whereby the motor may render said cam member ineffective,including a normally ineffective clutch, and means whereby operation ofthe carriage-return key will render the cam-controlling clutch effectiveso that the motor will render the cam member ineffective.

31. 1n a combinedftypewriting and computing machine, the combination ofla carriage, computing mechanism comprising denominational selectingmechanism including a selector, a cam member to hold said selector ineffective position while the carriage traverses a computing zone, amotor, a motor-circuit including-a switch, carriage-returning mechanismby which the motor may return the carriage, said carriage-returningmechanism including a clutch to connect the motor with the carriage orto disconnect it therefrom,

a controlling member for said clutch and.

said switch, spring means urging sad'controlling member to close theswitch and render `said clutch effective, latching means to hold saidcontrolling member against the action of said spring means, Jacarriage-return key to release said controlling member, camcontrollingmeans, whereby the motor may render said cam member ineffective,including a normally ineffective clutch, means whereby operation of thecarriage-return key will render the cam-controlling clutch effective sothat the motor will render the cam member ineffective, andcarriage-controlled` means for restoring said controlling member to theposition at which said latching means becomes effective.

32. 1n a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising denominational selectingmechanism including a selector, a cam member to hold said selector ineffective position while the carriage traverses a computing zone, amotor, ja motor-circuit includin a switch, carriagereturning mechanism ywhich the motor may return the carriage, said carriage-returningmechanism including a clutch to connect the motor with the carriage orto disconnect it therefrom, a controlling member for said clutch andsaid switch, spring means urging said `controlling member to close theswitch and render said clutch effective, latching means to hold saidcontrolling member against the action of said spring means, a.carriage-return key to release said controlling member, cam-controllingmeans, whereby the motor may render said cam member ineffective,including a normally ineffective clutch, means whereby operation of thecarriage-return key will render the camcontrolling clutch effective sothat the motor will render the cam member ineffective, latching means tohold said cam member in ineffective position, and carriage-controlledmeans for restoring said controlling meinber to the control of itslatching means and for releasing the cam member from its latching means.

33. 1n a combined typewriting and coniputing machine, the combination ofa carriage, computing mechanism comprising a register, computingelements upon which a number may be set up, operating means to actuatethe computing elements to run the set-up number into the register,carriagereturning means, a motor to actuate the operating means and thecarriage-returning means, a clutch to connect the motor with theoperating means, a 'switch (for said motor, means comprising a key torender said clutch effective and close the switch simultaneously, meansto automatically render the clutch ineffective, when the operating meanshas completed a cycle, and means to automatically stop the motor whenthe carriage reaches the end of' its return movement.

34;. 1n a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising denominational selectingmechanism including a selector, a. cam member to hold said selector ineffective position while the carriage traverses a computing zone, amotor, a motor-circuit including two switches in parallel.carriage-returning mechanism by which the motor may return the carriage,said carriage-returning mechanism including a clutch tol connect themotor with the carriage or to disconnect it therefrom, a controllingmember for said clutchv and one of said switches, spring means urgingsaid controlling member-to close the switch associated therewith andrender said yclutch effective, latching means to hold said controllingmember against the action of' said spring means, a carriage return keyto release said controlling member, cam-controlling means whereby themotor may render said cam member ineffective, including a normallyineffective clutch, and means whereby operation of the carriage-returnkey will close the other switch and render the cam-controlling clutcheffect-ive to permit the motor to render the cam member ineffective.

1n -acombined typewriting and computing machine, the combination ofacarl'iage` computing mechanism comprising a register, computing-elements upon which a number may be set up, operating means to actuateIthe computing elements to run the set-up number into the register,carriage-returning means, a motor to actuate the operating means and thecarriage-returning means, a clutch to connect the motor with theoperating means, a switch for said motor, means comprising akey-operated lever to close said switch, a rock-shaft operable by thekey-lever, a lever operated bv said rockshaft, and means operable bysaid last-mentioned lever to render said clutch eective.

36. ln a combined typewriting and computing machine, the combination ofa oarriage, computing mechanism comprising a register, computing devicesupon which a number may be set up, operating means to actuate thecomputing devices to run the set-up number into the register, a motor toactuate the operating means, a normally ineffective clutch, an elementto render said clutch effective, a key to actuate said element,carriage-returning means comprising a normally ineffective clutch, acarriage-re turn key to render the last-namedclutch effective, and meansactua-ble by the carriagereturn key to actuate said element to renderthe first-named clutch effective.

3T. ln a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a register, computing devicesupon which a number may be set up, operating means to actuate thecomputing devices to run the set-up number into the register, a motor toactuate the operating means, normally ineffective connecting means, anelement to rendei' said connecting means effective, a key to actuatesaid element, carriage-re turning means, normally ineffective connectingmeans for the carriage-returning means, a. carriage-return key to renderthe last-named connecting means effec-tive, and means actuable by thecarriage-return key to actuate s-aid element to render the first namedconnecting means effective.

38. in a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a general operator, numeralkeys, carriage-re turning means, means to actuate the carriage-returningmeans and the general operator simultaneously, means actuable by thegeneral operator to lock the numeral keys while the carriage isreturning,v and means to maintain the numeral-keylocking means ineffective condition.

39. ln a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising denominational selectingmechanism including a selector, a cam member to hold Said selector ineffective position while thecarriage traverses a computing Zone, amotor, a motor-circuit including two switches in parallel,carriage-returning mechanism by which the motor may return the carriage,said carriage-returning mechanism includ ing a clutch to connect themotor. with the carriage or to disconnect it therefrom, a controllingmember for said clutch and one of said switches, spring means urgingsaid controlling member to close the switch associated therewith andrender said clutch effective, latching means to hold said controllingmember against the action of said spring means. a carriage-return key torelease said ideama controlling member, cam-controlling means, wherebythe motor may render said cam member ineffective, including a normallyineffective clutch, means whereby operation of the carriage-return keywill close the other switch and render the cam-controlling clutcheffective to permit the motor to render the cam member ineffective, anda separate key for closing the last-mentioned switch and rendering thecam-controlling clutch effective. g

40. ln a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising denomination-selecting means,the denomination-selecting means being operable by the carriage as ittraverses a computing Zone, carriage-returning means, means controlledby said carriage-returning;l means to render the denomination-selectingmeans ineffective on the return of' said carriage, numeral keys, andmeans operable by the denomination-selecting means when it is renderedineffective to render the numeral keys ineffective while the carriage isreturning.,

41. In a combined typewriting and computing machine, the combination ofa carriage, computing mechanism comprising a computation-determiningelement, carriagereturning means, means operable by saidcarriage-returning means to i'ender said ele ment ineffective on thereturn of said carriage, numeral keys, and means operable by said'element to render the numeral keys ineffective while the carriage isreturning.

42. ln a. combined typewriting and computing machine, the combinationof' a carriage, computing mechanism comprising denomination-selectingmeans, the denomination-selecting means being operable by the carriageas it traverses a computing zone, carriage-returning means, meanscontrolled by said carriage-'returning means to render saiddenomination-selecting means ineffective on the return of said carriage,numeral keys, means to preventv the simultaneousdepression of twonumeral keys, and means to render the depression-preventing meanseffective tolock all the numeral keys when the carriage is returning.

43. lin a combined typewriting and computing machine, the combination ofa carriage, computing mechanism, driving means for said computingmechanism, a normally ineffective clutch associated with the computingmechanism, carriage-returning means, a normally ineffective clutchassociated with the carriage-returning meansfa motor, a motor switch,and a key to render the. two clutches effective and to close the switchsimultaneously.

44C. lfn a combined typewriting and computing machine, the combinationwith a carriage, computing mechanism comprising a register, numeral keysto set up a number,

a general operator by which the set-up nurnber may be run into theregister, and carriage-returning means, of means to start thecarriage-returning means and cycle the general operator, mechanismoperable by the general operator to render the numeral keys ineffectivewhen the general. opera-tor is cycling, and means to retain saidmechanism effective until the carriage is returned.

45. In a combined typewriting and cornputing machine. the combination ofal carriage, numeral keys, computing mechanism comprising denominationalselecting mechanism including a selector, denomination dcvices in whichdigits may be indexed by said keys, a general opera-torfor computingnumbers so indexed, a Aam member to hold said selector in effectiveposition while the carriage traverses a computing zone, a motor, amotor-circuit including two switches in parallel. carriage-returningmechanism by which the motor may return the carriage, saidcarriage-retiirning mechanism including a clutch to ,:onncct the motorwith the carriage or to disconnect it therefrom, a controlling memberfor said clutch and one of said switches, spring means urging saidcontrolling member to close the switch associated therewith and rendersaid clutch effective, latching means to hold said controlling member ineffective position against the action of said spring means. acarriage-return key to release said controlling member, driving meansfor the general operator including a normally ineffective clutch, aseparate key, means whereby operation of' the separate key will renderthe general operator clutch effective and close the second switch sothat the motor will render the cam member ineffective, and means wherebyactuation of the general operator will shift said cam member toineffective position.

46. In a combined typewriting and computing machine, thecombination of acarriage, computing mechanism which may be set to the state of additionand to the state of' subtraction, and means to restore the computingmechanism to thestate of addition when the carriage is backed out of acomputing zone.

47. In a combined typewriting and computing machine, the combination ofa carriage. numeral keys, computing mechanism comprising denominationalselecting mechanism includingr a selector, denomination devices in whichdigits may be indexed by said keys, a general operator for computingrnumbers so indexed, a cam member to hold said selector in effectiveposition while the carriage traverses a computing zone, a motor, amotor-circuit including two switches in parallel, carriage-returningmechanism by which the motor may return the carriage, saidcarriage-returning mechanism including a clutch to connect the motorwith the carriage or to disconnect it therefrom, a controlling memberfor said clutch and one of said switches, spring means urging saidcontrolling member to close the switch associated therewith and rendersaid clutch effective, latching means to hold said cont-rolling memberin effective position against the action of said spring means, acarriage-return key to release said controlling member, 'driving meansfor the 0'eneral operator including a normally ineffective clutch, aseparate key` means whereby operation of the separate key will renderthe general open tor clutch effective and close the second switch sothat the motor will render the cam mem-ber ineffective, means wherebyactuation of the general operator will shift said cam member toineffective position. and latching means to hold said cam member inineffective position.

48. In a combined typewriting and computing machine, `the combination ofa carriage` numeral keys, computing mechanism comprising denominationalselecting mechanism including a selector, denomination devices in whichdigits may be indexed by said keys, a general operator for computingnumbers so indexed, a cam member to hold said selector in effectiveposition while the carriage traverses a computing zone, a motor. amotor-circuit including two switches in parallel, carriage-returningmechanism by which the motor may return the carriage, saidcarriage-returning mechanism including a clutch to connect the motorwith the carriage or to disconnect it therefrom` a controlling memberfor said clutch and 011e of said switches, spring means urging saidcontrolling member to close the switch associated therewith and rendersaid clutch effective, latching means to hold said controlling member ineffective position against the action of said spring means, acarriage-return key to release said controlling member. driving meansfor the general operator including ay normally ineffective clutch, aseparate key, means whereby operation of the separate key will renderthe general operator clutch effective and close the second switch sothat the motor will render the cam member ineffective, means wherebyactuation of the general operator will shift said cam member toineffective position, latching means to hold said cam member inineffective position, and carriage-controlled means for restoring saidcontrolling member to the control of its latching means and forreleasing said cam member.

GILBERT E. DE HAVEN.

OSCAR G. SCHAAF.

Witnesses: i C. C. LACY, I CLARENCE L. LEONARD.

